/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/****************************************************************************
* $Id: func_inet_aton.cpp 3923 2013-06-19 21:43:06Z bwilkinson $
*
*
****************************************************************************/

#include "functor_real.h"

#include "calpontsystemcatalog.h"
#include "functioncolumn.h"
#include "joblisttypes.h"
#include "rowgroup.h"
//#include <iostream> // included when debugging

namespace funcexp
{

//------------------------------------------------------------------------------
// Return input argument type.
// See mcs_add in udfsdk.h for explanation of this function.
//------------------------------------------------------------------------------
execplan::CalpontSystemCatalog::ColType Func_inet_aton::operationType(
    FunctionParm& fp,
    execplan::CalpontSystemCatalog::ColType& resultType)
{
    return fp[0]->data()->resultType(); // input type
}

//------------------------------------------------------------------------------
// Return IP address as a long long int value.
// SELECT ... WHERE inet_aton(ipstring) = 11111111 will call getIntVal()
//------------------------------------------------------------------------------
int64_t Func_inet_aton::getIntVal(rowgroup::Row& row,
                                  FunctionParm& fp,
                                  bool& isNull,
                                  execplan::CalpontSystemCatalog::ColType& op_ct)
{
//	std::cout << "In Func_inet_aton::getIntVal" << std::endl;

    int64_t iValue = joblist::NULL_INT64;

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        int64_t iVal = convertAton( sValue, isNull );

        if (!isNull)
            iValue = iVal;
    }

    return iValue;
}

//------------------------------------------------------------------------------
// Return IP address as a double value.
// SELECT ... WHERE inet_aton(ipstring) = '11111111' will call getDoubleVal()
//------------------------------------------------------------------------------
double Func_inet_aton::getDoubleVal(rowgroup::Row& row,
                                    FunctionParm& fp,
                                    bool& isNull,
                                    execplan::CalpontSystemCatalog::ColType& op_ct)
{
//	std::cout << "In Func_inet_aton::getDoubleVal" << std::endl;

    double dValue = doubleNullVal();

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        int64_t iValue = convertAton( sValue, isNull );

        if (!isNull)
            dValue = iValue;
    }

    return dValue;
}

//------------------------------------------------------------------------------
// Return IP address as a string value.
// We are starting with a string value, and we want to return a string value,
// so we might be tempted to just return the result from getStrVal(), as-is.
// But we still call convertAton() to validate that the IP address we have is
// a syntactically valid one.
// Don't know if this function will ever be called.
//------------------------------------------------------------------------------
std::string Func_inet_aton::getStrVal(rowgroup::Row& row,
                                      FunctionParm& fp,
                                      bool& isNull,
                                      execplan::CalpontSystemCatalog::ColType& op_ct)
{
//	std::cout << "In Func_inet_aton::getStrVal" << std::endl;

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        convertAton( sValue, isNull ); // ignore return value
    }

    return sValue;
}

//------------------------------------------------------------------------------
// Return IP address as a boolean?
// getBoolVal() makes no sense for inet_aton() but we will implement anyway.
// Don't know if this function will ever be called.
//------------------------------------------------------------------------------
bool Func_inet_aton::getBoolVal(rowgroup::Row& row,
                                FunctionParm& fp,
                                bool& isNull,
                                execplan::CalpontSystemCatalog::ColType& op_ct)
{
    bool bValue = false;

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        int64_t iVal = convertAton( sValue, isNull );

        if ((!isNull) && (iVal != 0))
            bValue = true;
    }

    return bValue;
}

//------------------------------------------------------------------------------
// Return IP address as a decimal value.
// SELECT ... WHERE inet_aton(ipstring) = 11111111. will call getDecimalVal()
//------------------------------------------------------------------------------
execplan::IDB_Decimal Func_inet_aton::getDecimalVal(rowgroup::Row& row,
        FunctionParm& fp,
        bool& isNull,
        execplan::CalpontSystemCatalog::ColType& op_ct)
{
//	std::cout << "In Func_inet_aton::getDecimalVal" << std::endl;

    execplan::IDB_Decimal dValue ( joblist::NULL_INT64, 0, 0 );

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        int64_t iValue = convertAton( sValue, isNull );

        if (!isNull)
            return execplan::IDB_Decimal( iValue, 0, 0 );
    }

    return dValue;
}

//------------------------------------------------------------------------------
// Return IP address as a date?
// getDateIntVal() makes no sense for inet_aton() but we will implement anyway.
// Don't know if this function will ever be called.
//------------------------------------------------------------------------------
int32_t Func_inet_aton::getDateIntVal(rowgroup::Row& row,
                                      FunctionParm& fp,
                                      bool& isNull,
                                      execplan::CalpontSystemCatalog::ColType& op_ct)
{
    int32_t iValue = joblist::DATENULL;

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        int64_t iVal = convertAton( sValue, isNull );

        if (!isNull)
            iValue = iVal;
    }

    return iValue;
}

//------------------------------------------------------------------------------
// Return IP address as a date/time?
// getDatetimeIntVal() makes no sense for inet_aton() but we will implement
// anyway.
// Don't know if this function will ever be called.
//------------------------------------------------------------------------------
int64_t Func_inet_aton::getDatetimeIntVal(rowgroup::Row& row,
        FunctionParm& fp,
        bool& isNull,
        execplan::CalpontSystemCatalog::ColType& op_ct)
{
    int64_t iValue = joblist::DATETIMENULL;

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        int64_t iVal = convertAton( sValue, isNull );

        if (!isNull)
            iValue = iVal;
    }

    return iValue;
}

int64_t Func_inet_aton::getTimeIntVal(rowgroup::Row& row,
                                      FunctionParm& fp,
                                      bool& isNull,
                                      execplan::CalpontSystemCatalog::ColType& op_ct)
{
    int64_t iValue = joblist::TIMENULL;

    const std::string& sValue = fp[0]->data()->getStrVal(row, isNull);

    if (!isNull)
    {
        int64_t iVal = convertAton( sValue, isNull );

        if (!isNull)
            iValue = iVal;
    }

    return iValue;
}

//------------------------------------------------------------------------------
// Convert an ascii IP address string to it's integer equivalent.
// isNull is set to true if the IP address string has invalid content.
// Source code based on MySQL source (Item_func_inet_aton() in item_func.cc).
//------------------------------------------------------------------------------
int64_t Func_inet_aton::convertAton(
    const std::string& ipString,
    bool& isNull )
{
    char c = '.';
    int dot_count = 0;
    unsigned int  byte_result = 0;
    unsigned long long result = 0;

    const char* p   = ipString.c_str();
    const char* end = p + ipString.length();

    // Loop through bytes in the IP address string
    while (p < end)
    {
        c = *p++;

        int digit = (int) (c - '0');  // Assume ascii

        if (digit >= 0 && digit <= 9)
        {
            // Add the next digit from the string to byte_result
            if ((byte_result = byte_result * 10 + digit) > 255)
            {
                // Wrong address
                isNull = true;
                return 0;
            }
        }
        // Detect end of one portion of the IP address.
        // Shift current result over 8 bits, and add next byte (byte_result)
        else if (c == '.')
        {
            dot_count++;
            result = (result << 8) + (unsigned long long) byte_result;
            byte_result = 0;
        }
        // Exit loop if/when we encounter end of string for fixed length column,
        // that is padded with '\0' at the end.
        else if (c == '\0')
        {
            break;
        }
        else
        {
            // Invalid character
            isNull = true;
            return 0;
        }
    }

    if (c != '.')  // IP number can't end on '.'
    {
        //
        // Handle short-forms addresses according to standard. Examples:
        // 127     -> 0.0.0.127
        // 127.1   -> 127.0.0.1
        // 127.2.1 -> 127.2.0.1
        //
        switch (dot_count)
        {
            case 1:
                result <<= 8; /* Fall through */

            case 2:
                result <<= 8; /* Fall through */
        }

//		std::cout << "aton: " <<
//			(result << 8) + (unsigned long long) byte_result << std::endl;

        return (result << 8) + (unsigned long long) byte_result;
    }

    // Invalid IP address ended in '.'
    isNull = true;
    return 0;
}

}
